Monitor arm



FIG. 1 is a back perspective view of the monitor arm embodying the new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a top view thereof; and

FIG. 8 is a bottom view thereof; and,

FIG. 9 is another perspective view thereof, further illustrating monitor and desk attachment mechanisms.

Broken lines are used to illustrate features of the monitor arm that form no part of the claimed design. 

CLAIM The ornamental design for a monitor arm, as shown and described. 